CATALYST FOR EXOTHERMIC OR ENDOTHERMIC REACTION, CATALYST FOR WATER-GAS-SHIFT REACTION AND CATALYST FOR SELECTIVE OXIDATION OF CARBON MONOXIDE, AND PLATE-FIN HEAT EXCHANGE TYPE REFORMER

摘要

A catalyst for an exothermic reaction such as burning or an endothermic reaction such as steam reforming and a method for preparing the catalyst; a catalyst for a water-gas-shift reaction or a selective oxidation of carbon monoxide and a method for preparing the catalyst; and a plate-fin heat exchange type reformer. A method for preparing a catalyst wherein a metal or a metal oxide having a catalytic activity is homogeneously carried in a high degree of dispersion, which comprises forming a porous oxide film on a metal substrate, immersing the resultant substrate in an aqueous solution of a met al compound being a weak electrolyte having a small degree of dissociation or i n an organic solvent solution of a metal compound, and then firing the resulti ng product. A plate-fin heat exchange type reformer having a high electrothermi c efficiency characterized in that a plurality of heat exchange elements each of which has a catalyst for burning reaction on one face of a barrier plate and a catalyst for a steam reforming reaction, a catalyst for a water-gas-shift reaction and a catalyst for a selective oxidation of carbon monoxide on the other face thereof are laminated. The above catalysts are suitable for use i n a hydrogen generator for a solid polymer type fuel cell, since it has a high activityat a relatively low temperature and is reduced in the by-production of carbon monoxide.